Red-violet coloring-matter.



UNITED sTA'rss PATENT OFFICE.

oscAn GT'JNTHEB, on ELBERFELD, GERMANY, ASSIGNOR '10 FARBENFABRIKEN VORM. Eamon. BAYER & 00., OF ELBERFELI), GERMANY, A CORPORATION OF GERMANY.

RED-VIOLET COLORING-MATTER.

No Drawing.

To all 'who m it may concern.

Be it known that l, Oscar: Gtix'mnn, doctor of philosophy, chemist, citizen of the German Empire, residing at l llberfeld. Germany, have invented new and useful l'mprovements in Red-Violet Coloring-Matter, of which the following is a specification.

My invention relates to the manufacture and production of new azo dyes which dye cotton from red to violet-red shades fast to light.

j 'llhe process for their production consists in combining the tetrazo compound of parapara'- diaminodiphenylurea-meta-metadisult'onic acid in acid or neutral solution with one molecule of a Lumino-8-naplntho1-6sultonic acid compound of the formula SO H are after being dried and pulverized in. the shape ot their sodium salts dark powders Z soluble in water; yielding upon reductlonl with stanuous chlorid and hydrochloric acid para-para-d1aminodlphenylurea-metan1eta-d1sultonic acid which is further split ,up into (l0 and para-pllenylenediamin-suli 'lonic acid, a 1.:Z-diamine-Seraphthol sult'omc acid compound:

and a LG-dinmino-5-naphthol-Tsultonic acid compound:

. l a souu 1 1 Nlh (in 1t having the above defined meaning.

Specification of Letters Patent. Application filed m 18, 1911. Serial No. 639,125.

Patented lYlov. 28, 1911.

R l'l which may be replaced by a substituent e. g.

etc., as one component and in alkaline or neutral solution wlth a 2-am1no-5-naphth0l- 7 -sulfon1e acld compound of the formula:

as second component.

The new dyes having formula:

most probaply the The following example may illustrate my invention, the parts being by weight:-The tetrazo compound obtained from 402 parts of para para diaminodiphenylurea metameta'-disulfonic acid (see United States Letters Patent No: ($87171, dated November 19, 1901) is combined with .261 parts of the sodium salt of 2-amino-8-naphtlml-6'sultonic acid and the resulting intermediate 1 compound is combined in alkaline solution with 315 partsof 2-phenylamino-5-naphthol-T-sulfoni 1' acid. The dye is salted out, filtered otl' and dried. It is after being dried and pulverized in the shape ofits sodium salt a dark powder soluble in concentrated sulfuric acid with a blue coloration; yielding upon reduction with stannous chlorid and hydrochloric acid para-para-diaminodiphenylurca meta. mcta.- disulfonie acid which is further split up into CO and paraphenyleilediamin-sulfonic acid, 1.2-(liamin0- tl-naphtliol-li-sultonie acld and 2-phenylamiiio-(i-amino-S-naphthoL'Z-milfonic acid. The new dye dyes cotton,a reddisl1-violet shade l'ast to light and to ironing.

I claim urea-meta-meta'-disulfonic acid which is 1. The herein described new azo dyes obfurther split up into CO and para-phenyltainable from Q-amino-8-naphth0l 6-su1fonic enediamin-sulfonic acid, a 1.2 diamino-8- acid, sulfo acids of diaminodi ihenylureas naphthol sulfonic acid compound and a and 2-amino-5-naphthol-7 -su fonic acid 2.6-diamino-5naphthol-7-sulfonic acid comwhich are after being dried and pulverized pound; dyeing cotton from red to violet-rel in the shape of their sodium salts dark shades fast to light, substantially-as dcpowders soluble in water, yielding upon re scribed.

duction with stannous chlorid and hydro- 2. The herein described new azo dye havchloric acid para-para-diaminodiphenyling most probably the formula:

S oan i which is after being dried and pulverized and dyeing cotton a reddish-Violet shade in the shape of its sodium salt a dark fast to light and to ironing, substantially as powder soluble in concentrated sulfuric acid described.

with a blue coloration; yielding upon re In testimony whereof I have hereunto set duction with stannous chlorid and hydromy hand in the presence of two subscribing chloric acid para-para-diaminodipheny1- witnesses. ureameta-meta-d1sulf0n1c acld which is further split up into CO and para-phenylcncdiamin --sulfonic acid, 1.2 diamino 8 napthol 6 sulfonic acid and 2 phenylam ino 6 amino 5 naphthol 7 sulfonic acid;

OSCAR GUNTHER. [11.8.]

Witnesses ALFRED HENKEL, ALBERT T. NUFER. 

